EICAS

Engine Indication and Crew Alerting System

Legacy EICAS layout with single-ended engine thrust bars.

EICAS is an acronym for Engine Indication and Crew Alerting System.
One interlinked system that informs the crew about aircraft operation and warnings about abnormal settings or situations.

The Engine Indication shows normal operational information such as:

• Fuel available
• Thrust output

Additional information can be found depending on the model:

• Landing gear
• Pitch trim
• Flap settings

Legacy engine indications

On displays with the original single-ended thrust bars, including the T-19, the box above the engine shows an amber "REV" when reverse is selected.

E-10 and E-11 split-flow indications

In client versions equipped with the split-flow E-10/E-11 display, each engine bar grows outward from a central white datum. The upper half shows exhaust from the bow outlet; the lower half shows exhaust from the aft outlet. These are exhaust directions, not directions of aircraft motion: aft exhaust produces forward thrust, while bow exhaust produces reverse thrust.

The number beside each half is actual outlet output as a percentage of its own rating. Each half has an independent 0-100% scale. Both wing-engine halves can be filled during VTOL; two 100% readings do not mean 200% net axial thrust or 200% vertical lift. The bars report outlet output before its force is resolved into axial and vertical components. Moving chevrons stay inside the filled area and follow the exhaust direction. Remaining flow continues to be indicated during spool-down after the thrust request is released.

The engine boxes identify ENG1 (left), ENG2 (tail) and ENG3 (right), with these mode labels:

• FWD / REV: aft-only or bow-only exhaust with the nozzles in their axial position. These are green normal-operation indications.
• MIX: both axial outlets have flow.
• TRANS: wing nozzles between the axial and VTOL positions; shown in amber.
• VTOL: wing nozzles in their VTOL position. Read the two percentages for actual flow; VTOL alone does not mean that thrust is being produced.
• IDLE / OFF: zero outlet flow with propulsion powered or unpowered, respectively.
• FAIL: the engine is failed; shown in red.
• DATA: valid propulsion data is unavailable; shown in amber with dashes in place of outlet percentages. Do not read this as zero thrust.

The E-10/E-11 tail engine remains axial during VTOL. Its bar shows actual tail thrust, including thrust allocated to balance axial force from the wing engines. During atmospheric flight, ascent, suborbital coast, orbit and re-entry, the bars continue to show actual main-engine outlet flow; the presence of a bar does not mean VTOL is permitted in that flight regime. These bars do not display RCS activity. Landing-gear indications remain separate.

MFD page selection

Selecting Orbit or another MFD page does not acknowledge crew alerts or remove EICAS indications. A powered, serviceable EICAS continues showing the indications appropriate to the vehicle and its current state. Gear, engine, trim or CAS layers disappearing only while ORB1 is selected indicate a display-rendering fault; do not interpret that disappearance as a cleared alert.